Derrick



J. J. OLSON.

DERRICK'.

APPLICATION FILED JAN. Il. 19H1.

l -3 l 4,35 '7 Patented Aug. 26, 1919.

4 2 SHEETS-SHEET l.

gru/venlo@ J. l. OLSON.

DERRICK.

APPLICATION FILED IAN. II. |9111.

Patented Aug. 26, 1919.

2 SHEETS-SHEET 2.

35% MM2' /a/J- Gnozum UNITED STATES PATENT OFFICE.

JOHN J'. OLSON, 0F BELVIEW, MINNESOTA.

i i DERRICK.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application filed January 11, 1918. Serial No. 211,405.

To all whom it ma concern:

Be it known t at I, JOHN J. OLsoN, a citizen of the United States ofAmerica, residing at Belview, in the county of Redwood and State ofMinnesota, have invented new and useful Improvements in Derricks, ofwhich the following is a specilication.

The invention relates to an improvement in a form of derrick to be usedfor hoisting one end of automobiles, wagons or the like, so that a fullview underneath may be had thereof.

Its principal obiect is to provide a device of this character y means ofwhich either the front or rear end of a vehicle may be raised quicklyand eii'ectively.

A further object is the provision of a device of this character whichmay be readily folded into a compact bundle when not in use.

A still further object is to provide a device of this character which,may be easily and cheaply made 'and which will be simple in constructionand operation.

Other and further objects will appear as a detail description of thedevice progresses.

To the exact construction shown in the drawings, the invention is not tobe restricted. The right is reserved to make such changes or alterationsas an actual reduction to practice may suggest, provided such changes oralterations do not deviate from the spirit of the subjoined claims.

In the accompanying drawings:

Figure 1 is a side elevation of the invention, showing it in use as ameans for raising the rear end of an automobile.

Fig. 2 is a perspective view of the tripod.

Fig. 3 is a perspective view of the vehicle supporting frame.

Fig. 4 is a vertical sectional view through the apex of the tripod andone of the legs thereof.

Fig. 5 is a detail sectional view through the plate connecting the legsof the vehicle supporting frame.

Fig. 6 is a detail sectional view showing the manner in which theattendant sections of the supporting braces for the legs of the 1 hasformed on each of its three sides slots 3 which open at the bottom oflthe crown piece and in these slots the upper ends of the legs 2 areattached by pivotal engagement with the pins 4 which are positionedtransversely in the slots and are fixed to the walls thereof on oppositesides of the slots. The pins 4 are fixed at substantially the middle ofthe slots with reference to the length and depth of the latter. Belowthe point where the pins are carried the slots are made deeper than athigher points, so that the legs 2 may be moved in toward the center ot'the crown piece. To preclude movement of the legs away from the crownpiece farther than a specified distance, the slots 3 are so formed thatthe ends of the legs above the pins 4 may abut the bottoms of the slots.

Each of the legs 2 is provided on its bottom end with a easter 5 that issuitably attached thereto and the three legs are connected near theirlower ends by sectional braces 6. Each of these sectional braces 6comprises a section 7 and a section 8 which are pivotally connectedtogether by means of a stud 9. The free ends of the two sections 7 and 8connect one to each of any two adjacent legs 2, the connections with thelegs being pivotal and effected by means of the studs 10 which looselyengage the ends ot the sections but which are fixed in the legs. Thesection 8 overlaps the section 7 beyond a point where it effects pivotalengagement with the latter and the end of this overlapping portionreceives Va thumb screw 11 which threads through it and sinks itsconical end 12 in a counter-sunk conical depression formed in thesection 7. The purpose of this screw 11 is to effect a rigid connectionbetween the sections 7 and 8 when it is So desired, the withdrawing ofthe screw from the conical depression referred to permitting thesections to be moved with reference to each other on the pivotalconnection 9. l

On the bottom face of the crown piece 1 a screw eye 13 is suitablyattached by threaded engagement in the center of the crown piece. Thepurpose of this screw eye is to support the block and tackle 14, thefree end of the tackle passing down one of the legs 2 and winding on arotatably mounted drum 15 provided with ratchet teeth 16 and a crankhandle 17. A pawl 18 is loosely swung from the leg 2 just below theratchet teeth and is designed to engage the latter and prevent the drumfrom such movement Y baseof the trapezoid and supported on pins as willtend to unwind the carried thereon. Y

Coperating with the tripod A there is a vehicle supporting frame B. Thisframe comprises a plate 19 vand the attendant legs 20 *which arepivotally connected to the plate. In plan the plate 19 has the Vshape ofan isosceles trapezoid and the legs 2O are attached thereto on thelonger base, being held in slots 21 formed` in this longer.

end of the tackle 22 near-theends of the slots. The slots 21 are soformed that the legs V2O may be moved toward each other but are limitedkto a dis-v tance which they may be moved away from reach other, the endsof the slots wherein the 215 which lies in a plane at right angles withlegs are attached being inclined, so that the legs may lie against theseinclined ends atA the same,angleofinclination with respect to theparallel sidesof .the plate 19 that the inclined sides of the plate havewith respect ,to these parallel sides. An eye 23 is formed transverselyinthe plate 19 at the longitudinal center of the latter` and at theopposite side from that in .which the slots 21 vare formed. This eye isdesigned to be engaged by a hook 24:' carried by the block andrtacklesothat'the plate may be raised for a pur-l pose yet tobe described. Thefree end'of each leg 20 terminates in a curved portion the plate'19.Just back of these curved por- Y tions'25 the two legs' are joinedtogether by a brace 26 which, with the exception of its longitudinaldimension, is identical with the Y Vbraces 6. Between the brace 26 andthe` bile or other vehicle being raised for inspecturned by the crankhandle 17. This operation, of course, raises that .axle of the vehiclewhich the hooks 27 engage and, as Y the frame B is being raised, thecasters 10 permit the tripod A to roll in, so that 'the eye 23 intherplate 19 may remain always directly below the center of the tripod.The

` ends of the vframe B haverno casters and their frictional Yengagementwith the ground preclude any longitudinal movement of this frame.Raising the end having the plate 19y though, causes this end to describean areV and the casters on the tripodfA permit the Both these hookmembers are Y .spect to the ground. Y ,Y

tripod to ,roll in to accommodate for this.V

Y Were this provision not made, the raising of the frame B would movethis end to one side fof the center of the tripod v and might result inthe overturning ofthe latter..V yAs long as the pawl 18 remains inconnection'with .one of the ratchetvteeth of thedrurn 15 any vehicleVthat is so raised `with the device will remain suspended for inspection.The removalv of the4 pawl from the teeth will permit the reverseoperation of the drum and the lowering -of the frame B.

When the device is not in. use it maybe r easily folded up, theparticular method of construction making provision. for this. Thedisengaging of the screws 11 of thefsec'- Y tion 8 from theconical-shaped.depression in the section7; will'permit the braces .6to

be folded onthemselvesand,` theVv pivotal mountings on the legs 2 willpermit their beingfoldedagainst eachother with Ythe foldingrup of thebraces. By this means,

the tripod A is collapsed andthe'fvehicle V:

supporting frame ,B- is Vcollapsed in the same wayby the folding up' ofitsbrace 26A whichis identical inconstruction with the braces 6.'IhelframeY Band tripodA may then be formed into a compact bundle for. Y

transportationY t0 age other points. Eor for stor- Y1. In a device asset forth, a hoisting `apparatus, and a vehicle supporting frame, thelatter comprising a plate, legs pVotally connected to the plate, thelegsbeing formed with curved endsl whose extremities lie sub-V he inventionhaving Vbeen described, whatis claimed as new and useful is:

stantially inplanes at right anglesto the 2. In a yvehicle hoist, ahoisting frame," i

casters on which theqsaid hoisting frame is carried, a vehiclesupportingv frame having axle engaging means and ground engaging Y.

ends, and hoisting means carried V'by the hoisting frame' and engagingthe remaining',V

end of the vehicle supporting frame, where-V by the said endfof thesaidsfr-ame may Vbe elevated'to lhoist oneendof avehicle,- the Y casterson the hoisting frame-'permittingthef latter to move as the said'end ofthe;vehicle supporting frame is raised to keepV suchend below the centerof the hoisting frame without movement oftheV ground Vengaging end ofthevehicle supportingfframe Vwith re-' In testimony whereof -I aiiix mysignature.` 'Y

JoiviN J. oLsoN.v

I Copies of thispatent may be obtained for vejcents Veach', byaddressing the Commissioner of Iatents,

Washington, D. G.

